AtMail Open provides scalable, customizable webmail. By Lisa Hoover on June 17, 2008 (9:00:00 PM) AtMail Open, released under the Apache 2.0 License, is a completely customizable, AJAX-driven webmail client for use in the enterprise.
AtMail's customers include such notables as Coldwell Banker and Red Hat India, but Vice President of Sales Corey Bissaillon says the software will scale just as well for smaller customers. "In addition to government, universities, and corporate institutions, we've got nonprofits, ISPs, and so on. In fact, ISPs are big on AtMail because they can rebrand it. And that's all about, obviously, the full source code being available. " RoundCube Webmail Project.